centered colon

Signed-off-by: Todica Ionut <[email protected]>

website/TechnicalIntroduction.rst

@@ -389,17 +389,17 @@ Examples:
 1. The levels in a ``RIPMAP_LEVELS`` file whose highest-resolution
 level contains 4 by 4 pixels have the following level numbers:
 
-+------------+-------+------------------------+
-|            |       | .. centered::**width** |
-+------------+-------+-------+-------+--------+
-|            |       | **4** | **2** | **1**  |
-+------------+-------+-------+-------+--------+
-|            | **4** | (0,0) | (1,0) | (2,0)  |
-+------------+-------+-------+-------+--------+
-| **height** | **2** | (0,1) | (1,1) | (2,1)  |
-+------------+-------+-------+-------+--------+
-|            | **1** | (0,2) | (1,2) | (2,2)  |
-+------------+-------+-------+-------+--------+
++------------+-------+-------------------------+
+|            |       | .. centered:: **width** |
++------------+-------+-------+-------+---------+
+|            |       | **4** | **2** | **1**   |
++------------+-------+-------+-------+---------+
+|            | **4** | (0,0) | (1,0) | (2,0)   |
++------------+-------+-------+-------+---------+
+| **height** | **2** | (0,1) | (1,1) | (2,1)   |
++------------+-------+-------+-------+---------+
+|            | **1** | (0,2) | (1,2) | (2,2)   |
++------------+-------+-------+-------+---------+
 
 In an equivalent ``MIPMAP_LEVELS`` file, only levels (0,0), (1,1), and (2,2)
 are present.